Check-valve.



G. A. GASE.

CHECK VALVE.

APPLICATION FILED JUNEZZ, 1914.

1,142,513. Batented une 8,1915.

i k i 34 2w m4 M 2112 UNITED STATES PATENT oFFIcE.

GEOBGEA- GASE, OF (EEEVELAND, OHIO, ASSIGNOB, BYiMiES-NE ASSIGNMENTS, TOTHE ICEL ESS MACHINE C0M2ANY,1OF CLEVELAND, OHIO, A CORPORATION OF OHIO.v

CHECK-VALVE.

. Application filed June 22, 1914. -.seria1ato;a4e;m.

To all whom itm concern:

Be it known t at I, GEORGE A.'GASE, a citizen of the United States,resldlng at Cleveland, in the county of (Juyahoga and State of Ohio,have invented a certain new. and useful .'I-mprovement in Check-Valves,

of which the following is a full, clear, and

exact description, reference being bad to the accompanying drawings. n

This invention relates to check valves and more particularly to checkvalves adapted for use in passages for volatile liquids or vapors. Y I

The object of my invention 1s to provide "a check valve which shall bestrong and durable in construction and entirely automatic.

in its action, and which shall contain as few moving parts as iscompatible with the other objects hereinafter set forth;

A feature of my invention is that 1 provide a main valve closure, and asecondary valve closure co-a'cting with the same and adapted to readilyfind its seat by gravity. These closures are so arranged that the returnof the main valve closure to its seat is caused by the back pressure ofthe 'fluid in the passage when the secondary closure is seated, andaccordingly this closing op-.

central section through the valve; Fig. 2 is p a detail of the valvewhen open; Fig. 3 is a horizontal section of the valve on the line 33 ofFig. 1; Fig. 4 is a side elevation of the main valve plug.

Referring to the drawings by numerals, the housing for my valveas shown,comprises two chambered. members 10 and 11 clamped together at theirmargins by suitable bolts 12 and embracing between. them a disk ,4 whichis flanged at its periphery to provide a tight joint, and also toprovide a thin portion preventing distortion of themiddle portion whenclamped into position. This disk is adapted to divide the space betweenthe members 10 and 11 into two separate chambers 15 and 16 respec-Specificaticn of Letters Patent.

Patented June 8, 1915.

tivel-y, communicating with each other only through an axial bore 20 incentrally disposed bosses 21, formed on the disk 14. The

upper shell'chamber 10 is provided with a centrally located boss 17having a reduced threaded portion at its outer end adapted to beconnected ,by a suitable coupling (not shown) to one end of a break in aline pipe. An axial bore 18in the boss 17 provides communication betweenthe pipe and the chamber 15. At one'side of the lower shell member '11is shown a boss 28 provided with a passage 19, communicating at one endwith thechamber 16 and being internally threaded. at its outer end for'connection to the other endv of the above mentioned break in the linepipe, in which the valve is to be. laced. -hese openings form the outletan inletv passages respectively under normal conditions, and the valveclosures here-' inafter described are adapted to prevent a reverse ofthe conditions. v

A main closure or valve plug 25 comprising a headand tubular stem isprovided at its lower end with annular ridges adapted to slidably engagethe Wallsof the bore 20 and provide the familiar groove. packing.

The head of the plug is flanged, forming a shoulder beveled as at 26 andadapted to co-act with 'a beveled edge 27 of the'bore 20, thus formingthe main valve closure. Threaded into the lower end of the stem is showna bushing 29 having an axial bore 30, the lower end of whichcommunicates with the chamber 16 and the upper end of which provides aseat for a ball 31, which is the secondary valveclosurei A number ofports 34 are provided oints in the circumfera once of the Wal f-Qt evalve 25, between'the upper annularrld-ge and the beveled shoulder ofthehead.

It will be seen that the pressure transmitted from the line pipe throughthe passage 19 and into the chamber 16 is at all times actingl'on theexposed area of the valve closiire" jthereby tending to raise the same.Aslongkas this pressure continues, the fluid ma 7 hold the closures openand flow through the same from the chamber 16 to the chamber 15,-andfrom the passage 18, as described; On the upper surface of the valve 25,are lugs 36 adapted to abut the upper surface of}, the chamber 15 whenthe valve.is'open, thereby limiting the upward movement of the same butallowing communication between thechamber 15 in the' axial bore and thepassage 18. If at any time the pressure in the chamber 16 falls be-- lowthat of the chamber 15, the ball 31 being loose in its chamber 35, willreadily fall by gravity to its seat and shut 01f any return of theliquid through the bore 30, and

the preponderance of pressure in the cham- 1 and is held in place bybeing clamped between a flanged end of a screw 41 and the lower face ofthe chamber 16.

It will be seen that 1 have provided a valve which accomplishes thepurposes above set forth, and it willbe noted thatthe secondary valveclosure coacting with the first valve closure in the manner described,not only provides a double closure for the valve, but causes thissecondary closure to control the operation of the main closure bycausing the back pressure to act on its surface and forcethe same to itsseat.

Having thus described my invention, what I claim is:

1. In a check valve, the combination with a body, of a member having acylindrical bore forming a passage and having a seat, a main closurehaving a hollow stem extend ing into said bore and slidably engaging thesame and having an enlarged portion fitting said seat, an openingleading from the interior of the stem under said enlarged portion, acontracted portion within the stem forming the seat, and a ball closingsaid seat.

2. In a check valve the combination with a chambered casing,oii anintermediate member dividin the chamber andhaving a cylindrically oredboss, a valve seat at one end of the bore, a closure for said borehaving'a portion fitting said seat and having a hollp w portion fittinginto said bore, a groove on the exterior of the hollow portioncontiguous to the bore, a member secured to said hollow portion andhaving an opening therethrough, and a ball closing said openmg. a

3. In a check valve, the combination with a pair of chambered members,of a disk-like member clamped between them and having a centrallydisposed boss and a bore founing a passage through the boss, a plugslidable in said bore and having an enlarged portion closing the endthereof, a passage through said plug opening beneath the enlargedportion, a member-threaded into said plug and having an openingtherethrough communicating with said last named passage, and a ballclosing said opening.

4. The combination of a casing, a parti tion across the casing, atubular guide carried thereby, a hollow plug 'slidable in said guide andhaving an annular shoulder adapted to engage a seat formed on the guide,a member secured to the plug and providing a second seat, and a ballretained within the plug and adapted to seat on the second seat.

5. The combination of a casing, amember carried thereby and having atubular guide, a plug slidable within the guide and co-acting with it toform a valve, said plug having a recess, a sleeve carried by the plugand providing a seat, and a movable valve member confined by the sleevewithin the lug.

p In testimony whereof, I hereunto aflix my signature in the presence oftwo witnesses.

[I GEORGE A. GASE. Witnesses Geo. J. Srurronr, R. S. SPENCER.

